Very clean job. I would advise that you try the SuperFlip as opposed to the Duck Change. The Duck Change is amazing as you proved in your performance. However, the SuperFlip gives the trick a feeling of the card just being pulled through from the middle to the top, with the kicker of the card that they have just seen transformed going to the middle of the pack. However, your performance was amazing, my suggestion is only for you to try something a bit different and to have some fun with it, as obviously you are able to perform the trick without a hitch.
Please keep up the good work
Juan M.